Actually, the C4D support was a plugin for C4D itself, not for Terragen. Unfortunately nobody in the C4D community has done the same for TG2 yet.
TG2 does not use separate "script" (TGS) files like Terragen Classic did. Since the new Terragen "world file" format is human-readable XML, and almost every parameter can be animated, it made sense just to embed animation data in the TGD files. So all the information is there to be read, and in fact someone with some scripting knowledge in their application of choice ought to be able to convert and import that data. As has been mentioned, people in the 3DS Max and, apparently, Maya communities have done this. Perhaps you or someone you know has C4D scripting abilities they could apply to the problem?
TG2 does import CHAN (Nuke format) data, so if you have existing animation data to import and can get it into that format, you can sync TG2 up pretty easily.
More import/export functions will be added in the future.
- Oshyan